UnderCover: Waterproofing and Underpinning Secrets: Episode 22 💧 The Silent Killer – Why 1 in 5 Homes Has High Radon (And How to Get Grants to Fix It)

It is the threat you can’t see, smell, or taste—but it might be quietly ruining your lungs.

In Episode 22 of Undercover, we flip the script from the visible enemy (water) to the invisible one: Radon Gas.

We are in the dead of winter, which means the "Stack Effect" is turning your home into a vacuum, sucking radioactive gas right out of the soil and into your living space. With new 2026 data showing that 17.8% of Canadian homes now test above safety limits, this is a conversation we can no longer ignore.

Key Topics Covered:

• The Energy Efficiency Paradox: Why our "green," airtight homes are actually trapping more dangerous gas than drafty 1950s houses.

• The "Radon Highway": Why an unsealed sump pit is the biggest weakness in your foundation.

• The Science: How the "Evict Radon" study is using toenail clippings to prove the link between basement air and lung cancer.

• The Fix: Understanding Active Soil Depressurization (ASD) and why sealing alone isn't enough.

• Free Money: We break down the "Lungs Matter Grant" (up to $1500), Tarion Warranty coverage for new builds, and tax credits that can pay for your mitigation.

Fortify Your Foundation:Radon enters through the same cracks as water. To protect your home's envelope, you need to start by evaluating the right waterproofing methods for basements to seal fractures in the floor slab and cove joints.

We also discuss how installing sealed interior waterproofing systems—specifically air-tight sump pump lids—can stop gas migration, and the importance of applying protective exterior waterproofing systems to reduce the soil pressure against your walls.